Patent US1972789A successfully refreshed from Google Patents.
US1972789A
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Machine for and method of making commutator rings
Assignee: CONTINENTAL DIAMOND FIBRE CO
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Filing: 1930-02-08
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Granted: 1934-09-04
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Expires: 1950-02-08
Abstract
No abstract record available.
Inventors
- 👤 Floyd F Newkirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:38
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/38; B26F1/40; B28; B28D; B28D1/00; B28D1/32; B28D1/325; B29; B29C; B29C51/00; B29C51/08; B29C51/082; B29C51/087; B29C51/14; B26F1/44; B26F2001/4427; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1052; Y10T156/1062; Y10T156/107; Y10T156/12; Y10T156/1317; Y10T156/1322; Y10T156/1326; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-09-03 | 1938-03-05 | 1938-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-09-03 | 1942-03-05 | 1942-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-09-03 | 1946-03-05 | 1946-09-04 | $7700.00 | Window Closed / Lapsed |